An estimate of the period of construction for medium size residential buildings can be found with the following formula:
PC = 234 * C0.02
Where:
PC = period of construction in days
C = estimated building contract price in $ millions
.02 = a power factor which can be increased for larger and more complex buildings. For example, about 0.50 for a large CBD office tower.
EXAMPLE
Estimated building contract price: 360 000
PC = 234 * 0.3600.02
= 229 days
= 7.6 months (round to 8 or 3 quarters)